Liquid crystal display device with improved broken source line correction

Abstract

A liquid crystal display device includes: a display area; a non-display area; a plurality of gate lines; a plurality of source lines; a plurality of thin film transistors; a gate driver; a source driver; a control unit configured to supply a control signal to the source driver; and an auxiliary line extending in the non-display area from an end of one of the plurality of source lines to another end thereof, wherein each of the plurality of thin film transistors is turned on and off when one of the plurality of gate signals supplied to one of the plurality of gate lines connected to that thin film transistor changes to an ON voltage level and an OFF voltage level respectively, and the control signal rises at a different timing from a fall in one of the plurality of gate signals.

What is claimed is: 
     
       1. A liquid crystal display device comprising:
 a display area in which there is provided a matrix of pixels; 
 a non-display area around the display area; 
 a plurality of gate lines extending along respective rows of pixels; 
 a plurality of source lines extending along respective columns of pixels in a direction that intersects with the plurality of gate lines; 
 a plurality of thin film transistors, one for each pixel, connected respectively to the plurality of gate lines and the plurality of source lines; 
 a gate driver connected to the plurality of gate lines to sequentially supply a plurality of gate signals to the plurality of gate lines; 
 a source driver connected to an end of each of the plurality of source lines to supply a plurality of source signals to the plurality of source lines respectively; 
 control circuit configured to supply a control signal to the source driver via a control signal line, the control signal being a pulse signal for switching the plurality of source signals; and 
 an auxiliary line extending in the non-display area from an end of one of the plurality of source lines to another end thereof, wherein 
 each of the plurality of thin film transistors is turned on and off when one of the plurality of gate signals supplied to one of the plurality of gate lines connected to the each of the thin film transistors changes to an ON voltage level and an OFF voltage level respectively, and 
 the control signal is different from a clock signal that is input to the gate driver, and is a signal that is supplied from the control circuit to the source driver, and a potential of the source signal switches after the control signal rises at a different timing from a fall in one of the plurality of gate signals. 
 
     
     
       2. The liquid crystal display device according to  claim 1 , wherein the control signal reaches half an amplitude thereof while rising at a different timing from a timing when one of the plurality of gate signals reaches half an amplitude thereof while falling. 
     
     
       3. The liquid crystal display device according to  claim 1 , wherein the control signal rises at a timing outside a gate falling period in which one of the plurality of gate signals changes from the ON voltage level to the OFF voltage level. 
     
     
       4. The liquid crystal display device according to  claim 3 , wherein the control signal changes to the ON voltage level in a period outside the gate falling period. 
     
     
       5. The liquid crystal display device according to  claim 1 , wherein each of the plurality of source signals is switched between voltage levels in response to the control signal changing from the ON voltage level to the OFF voltage level. 
     
     
       6. The liquid crystal display device according to  claim 5 , wherein each of the plurality of source signals changes from a voltage level written to the pixels in an n-th one of the rows to a voltage level written to the pixels in an (n+1)-th one of the rows in response to the control signal rising and then falling after a fall in one of the plurality of gate signals supplied to one of the plurality of gate lines for the n-th one of the rows, where n is a natural number. 
     
     
       7. The liquid crystal display device according to  claim 1 , wherein the control signal line is capacitively coupled to the plurality of source lines.